Heinaich friedrich baedkb and wax



Reissued Sept. 21, 1926.

UNITED STATES PATENT ornce.

HEINRICH FRIEDRICH MED AND WALTER IIEG, O1 VOW, 63m, L5 7 1mm ASSIGmN'I'S, TO GBASSELLI Y.. A COBPOIi-QTION OF DELAWARE.

SIGIOBS, BY NEW YORK, N.

DYESTUI'I CORPORATION, OF

No Drawing. Original I6. 1.50am, tilted Application for reissue We have found that new and valuable dyestuffs can be obtained by treating aminodianthraquinonylamines with sulfonating agents.

5 The new dyes are after being dried and pulverized dark powders soluble in water generally with a violet to blue to green coloration. They are almost insoluble in dilute acids and dye wool from acid baths 10 from violet to greyish-blue to bluish-green shades fast to light.

In order to more fully, the the parts being by weight parts of 4.4'-diamino-1.1-dianthraquinonylamiue are dissolved in 250 parts of fuming sulfuric acid per cent S0,) while stirring and the resulting mixture is heated up to 100 C. until the sulfonic acid 2 will be produced which is soluble in water with a blue coloration. After cooling the melt is poured into 2,0002,500 parts of water, boiled up, filtered while hot and washed with a small quantity of water.

It is a dark powder scarcely filuble in cold, more easily soluble in greenish blue coloration, it is soluble in concentrated sulfuric acid with a bluish-green and in boiling glacial acetic acid with a pure blue coloration. It dyes wool bluish-grey shades fast to light and fulling.

illustrate our new process following example is given,

hot water with a grey sew-m- 10. um, um: Io. 04am. ma an; aim. fled an, 1:, mm mm lo. mas.

'lthe diamino-al ha-beta-dianthraquinonylamine gives a b ue-black dye, the 4.4'-dimethylaminoalpha alphadianthraquinonylamine (obtained from the dinitro compound and monomethylamine) gives a greyish-blue dye.

We claim:

1. The herein-described new dyestuffs bemgsulfomc acids of aminodianth uinonylamines, being after being dried an pulverized dark powders soluble in water generally with a violet to blue to green coloration; being almost insoluble in dilute acids and dyeing wool from acid baths from violet to grayish-blue to bluish-green shades fast to light, substantially as described.

2. The herein-described new dye being a sulfonic acid of 4.4-diamino-1.ldianthraquinonylamine, which is after being dried and pulverized a dark powder being scarcely soluble in cold and more easily soluble in hot water, being soluble in concentrated sulfuric acid with a bluish-green and in boiling glacial acetic acid with a pure blue coloration; dyeing woolfrom acid baths bluishshades fast to light and to fulling, substantially as described.

HEINRICH FRIEDRICH MEIER. WALTER IIEG. 

